| | From | Greg Kroah-Hartman <> | | Subject | [PATCH 32/67] serial: trim locking on the helpers | | Date | Thu, 5 Aug 2010 15:22:59 -0700 |
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From: Alan Cox <alan@linux.intel.com>
The port mutex protects port->tty, but these paths never need to walk from port->tty. They do need the low level lock as the API expects that but they already also take it.
Thus we can drop the extra mutex lock calls here.
Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/serial/serial_core.c | 5 +---- 1 files changed, 1 insertions(+), 4 deletions(-) diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 2379045..0603e0d 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -1506,12 +1506,10 @@ static int uart_carrier_raised(struct tty_port *port) struct uart_state *state = container_of(port, struct uart_state, port); struct uart_port *uport = state->uart_port; int mctrl; - mutex_lock(&port->mutex); spin_lock_irq(&uport->lock); uport->ops->enable_ms(uport); mctrl = uport->ops->get_mctrl(uport); spin_unlock_irq(&uport->lock); - mutex_unlock(&port->mutex); if (mctrl & TIOCM_CAR) return 1; return 0; @@ -1521,12 +1519,11 @@ static void uart_dtr_rts(struct tty_port *port, int onoff) { struct uart_state *state = container_of(port, struct uart_state, port); struct uart_port *uport = state->uart_port; - mutex_lock(&port->mutex); + if (onoff) uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); else uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); - mutex_unlock(&port->mutex); } /* -- 1.7.2
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